,s president barack obama said they have to find out why two young men who came to this country 10 years ago, who studied here and seem to be part of the fabric of society then suddenly decided to do what they did. who perhaps radicalize them, who guided them? was there someone dictating what they do? ity people leave -- believe is too disillusioned people -- two disillusioned young man working on their own. they will not get a chance to speak to him for the next few days at least. >> thank you. david has a bit more. ,his is the capital of dagestan where the parents of the suspect lived. >> the brothers did spend four months here, before the family moved to the u.s. the mother joint the father of the two brothers -- joined the father of the two brothers, saying they were set up and .ramed trad >> he was controlled by the fbi. my sons were innocent. they knew what he was doing and what sites on the internet he was going. they used to, talk to me. they said they are afraid of him. how could this happen? they were looking at every step of him. this is not true. my two sons are innocent. >>